The beginning of reality is vague to all. There were some creatures and Primordials that existed at the beginning of time. What really started the history of it was the eternal conflict between light and dark.
Grand unimaginable conflicts in the time of nothingness, created the void. It is something truly between the light and the dark. A very raw and real energy.
These three dynamics became what is known as magic. Magic is harnessing the light, the dark, the void, or a combination there of.
As the planes of reality began to develop and the magic within them was not well contained. It burst out multiplying each of the planes by an unimaginable number and creating critical regions that define what is outside of the planes along side a numerous number of planes that were nigh empty. What connects these planes are Lei Lines, in some of the planes these are known as Yamza. These are magical pathways that can be happened upon or be tapped into with powerful spells.
Some of the earliest wielder of magic where the Chromomancers, Virtuso, and Dragons.
Dragons are apex creatures spawned when great amounts of true magic are funneled into something. Chromomancers are wielders of the light capable of manifesting it and wielding it in ways they see fit. The Virtuso are pure wielders that learned the magic and recorded it by chance or by force, they are those who made what most mages study from now.
Each of these three also have holidays that are celebrated in most Material Planes. These are the a type of plane that is made up of typical logic and physics that is populated by a mixture of creatures and balance of magic types.
The Chromomancers celebrate the The Day of the Light.